Default hiw to unlock sim on lg l3 e400

hello im new here so please exuse my noobiness :P. well, i have an lg l3 e400 rooted, and i flashed cmmini 9 rom, it is currently locked to telcel (Mexico) and i want to unlock it so i can put any sim card from any providor. is there any method to fo this? thank you in advance for your answers